The state racing commission has put together a draft on the idea. The machines let people bet on past horse races without knowing which horse they are betting on. Virginia lawmakers legalized historic horse race gambling during this year’s legislative session as a way to help reopen Colonial Downs. The shuttered horse track outside of Richmond was recently bought by a Chicago-based firm. The racing commission’s draft rules would allow up to 700 machines at the track, with the rest at various off-track betting parlors.